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Node.js | Buffer.readIntLE() Method

  • Last Updated : 20 Dec, 2019

The Buffer.readIntLE() method is used to read number of bytes from a buffer at a given offset and interprets the result as a two’s complement signed value.

Syntax:

buffer.readIntLE( offset, byteLen )

Parameters: This method accepts two parameter as mentioned above and described below:
offset: It specifies the position of buffer object. It represents number of bytes to skip before starting to read. It lies within the range 0 to buffer.length – byteLen.
byteLen: It is an integer value that indicates the number of bytes that are to be read from the given offset. This parameter value lies with between 0 and 6.

Return value: It returns an integer value with byteLen bytes from the specified offset in little endian.

Example 1:






// Node.js program to demonstrate the
// buffer.readIntLE( offset, byteLen ) method 
const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]);
  
console.log(buff.readIntLE(0, 5).toString(16));
  
console.log(buff.readIntLE(0, 4).toString(16));

Output:

-76a9cbedef
56341211

Example 2:




// Node program to demonstrate the
// buffer.readIntLE( offset, bytelen ) method 
const buff = Buffer.from([0x11, 0x12, 0x34, 0x56, 0x89, 0xcd]);
  
console.log(buff.readIntLE(4, 6).toString(16));
  
console.log(buff.readIntLE(3, 0).toString(16));

Output:

buffer.js:831
    throw new RangeError('Index out of range');
    ^

RangeError: Index out of range
    at checkOffset (buffer.js:831:11)
    at Buffer.readIntLE (buffer.js:918:5)
    at Object. (/home/cg/root/8545664/main.js:8:17)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.runMain (module.js:604:10)
    at run (bootstrap_node.js:389:7)

The above example shows the error because its parameters are not in the valid range.

Note:

  • To get the values in Big endian format you can use Buffer.readIntBE() method.
  • The above program will compile and run by using the node index.js command.
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